KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU
Published Jul 25, 2026
8.2
HIGHCVSS 3.1
EPSS 0.18%
Description
flush_hyp_vcpu() copies the host vCPU context into the hyp's private vCPU on every run. ctxt_to_vcpu() expects a guest context to have a NULL __hyp_running_vcpu, which is only ever set on the host context, so that it resolves the vCPU via container_of(). While this is generally the case, flush_hyp_vcpu() copies the context verbatim and does not enforce this, so a value provided by the host is dereferenced at EL2 (host -> EL2).
Fix by clearing __hyp_running_vcpu after the copy.
Affected products
-
Affected
- ≥ , <
- ≥ , <
- ≥ , <
- ≥ , <
- ≥ , <
-
Affected
- 6.2
Unaffected
- ≥ 0, < 6.2
- ≥ 6.12.97, ≤ 6.12.*
- ≥ 6.18.39, ≤ 6.18.*
- ≥ 6.6.145, ≤ 6.6.*
- ≥ 7.1.4, ≤ 7.1.*
- 7.2
Default status is the baseline for the product. Each version can override it (patched versions can be marked unaffected).
- ≥ 6.2 · < 6.6.145
- ≥ 6.7 · < 6.12.97
- ≥ 6.13 · < 6.18.39
- ≥ 6.19 · < 7.1.4
No data.
Red Hat Enterprise Linux 10
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel
Affected
Red Hat Enterprise Linux 9
kernel-rt
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
No CWE recorded.
References (11)
- https://access.redhat.com/security/cve/CVE-2026-64286 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2507123 Issue Tracking
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-48998 Advisory
- https://git.kernel.org/stable/c/477145860dba4c30f0b4e36f02f4c5291c1c888b Patch
- https://git.kernel.org/stable/c/6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa Patch
- https://git.kernel.org/stable/c/d4f4d61715d1061ba83b88196a3605662be30750 Patch
- https://git.kernel.org/stable/c/dfaef40d8a1533940fc1af788d70fce07362b4ce Patch
- https://git.kernel.org/stable/c/e8042f6e1d7befb2fb6b10a75918642bcd0acf9a Patch
- https://lore.kernel.org/linux-cve-announce/2026072503-CVE-2026-64286-3ed3@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2026-64286
- https://www.cve.org/CVERecord?id=CVE-2026-64286
Change history (0)
No recorded changes yet.
CVE.org / MITRE
CISA Vulnrichment
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GitHub
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